Tax on European Marie Curie IF (Host institution in UK)

Dear All,

I have been in the UK for nearly a year now as a MSCA IF. My host institution has been paying me a gross monthly salary of 5650 GBP (I have not opted for the USS pension scheme, and have a family, so the gross amount may vary a bit for other research fellows in UK).

My question is about the "tax paid" that appears in my monthly salary slip (Not the NI Contribution, but the Tax). This monthly tax amount is 1230 GBP, which equates to about 21.5%. The tax code used by the University is 1257L.

Now I understand that the type of MSCA contract can vary by country. For instance, in Italy where I worked earlier, a MSCA IF gets an assegno di ricerca contract that is not taxed (no IRPEF, only social security INPS iis deducted by the host institution).

Could anyone please advise me if the tax that I am paying in the UK as a MSCA IF and UK tax resident is correct? I did ask my host institution and their response was that they have to use the tax code provided by the HMRC. In this case, the 1257L appears to be a standard tax code for a University researcher. So if as a MSCA IF I shouldn't be paying a tax or be in a lower tax regime, what do I need to do to correct my tax situation?

Thanks and regards,

Malcolm